500 ml Material: Eco-friendly and 100% recyclable stainless steel meterial 18/8 (304) stainless steel 2. Double-wall stainless steel can keep hot or cold for 24 hours. 3. With very strong handle, very suitable for carrying and using outside. 4. Large caliber design is convenient to clean inside and put ice cubes in. 5. With a plastic cup inside the cover, suitable to drink water outsidethermtempo